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问题 单项选择题

用惰性电极电解一段时间后，pH增大的是( )。

A．HCl
B．H2SO4
C．Na2SO4
D．NaHSO4

答案

参考答案：A

解析： A是电解HCl，其他都是电解水。

单项选择题

2006-2010学年，（）独家承办115所中央部属高校的国家助学贷款业务。

A.中国工商银行

B.中国农业银行

C.中国银行

D.中国建设银行
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单项选择题

●Documentation of a software package is normally produced for two purposes.One is to explain the __(71)__ of the software and describe how to use them.This is known as__(72)__because it is designed to be read by the user of the software.The other purpose of documentation is to describe the software’s internal composition so that the system can be maintained later in its lifecycle. Documentation of this type I sknownas __(73)__.

A．system documentation

B．user documentation

C．vender documentation

D．license documentation

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